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Grub Guard Beneficial Nematodes Control Your Garden's Worst Enemy

Contains naturally occurring, beneficial microorganisms that help control Japanese beetles

Attacks the soil-dwelling, grub stage of the beetle

Starts working within 48 hours, keeps working all summer long

Sprayer not included; we recommend our hose-end Dial Sprayer

Japanese beetles are one of the most destructive garden pests. As adults, they ravage your flowers and vegetables. As young grubs they devour your lawn's root system, and they attract skunks and moles. Grub Guard beneficial nematodes are naturally occurring microorganisms that live in the soil, feeding on Japanese beetle grubs. Unlike chemical controls, they won't harm earthworms or most beneficial insects, and they are safe around pets. Single-application sponge. The 1 million size will treat 2,000 square feet; the 6 million size will treat 12,000 square feet.

Product Details

Contains two species of beneficial nematodes: Steinernema carpocapsae and Heterorhabditis bacteriophora

I used this product twice this spring due to a heavy grub infestation in some of my raised beds. The first application did not do much, mostly because I didn't keep the soil damp enough, but the second one was more effective. I still have some grubs remaining, but they are far fewer in number. To apply the beneficial nematodes, I used a 1 gallon handheld sprayer and sprayed the soil well. It is very important that the soil is damp before application and to water well afterwards. Best results if the nematodes are applied in the evening and right before a rain shower or storm. It's also very important to keep the soil damp for several weeks afterwards. I used floating row covers to help retain soil moisture in my most problematic bed, and that seemed to have improved effectiveness. This product will work, but not immediately (takes a couple weeks for full effect) and only if you follow the instructions! You also may need more than one application for a heavy grub infestation. The biggest benefit is that it is safe and non-toxic.

So far so good. I've managed to spread the Grub Guard all over my yard and to date have not found any grubs or beetles which usually start showing up this time of year. I think one more treatment will help to keep these nasty critters away for the rest of the season.